Nut-lock.



umarmen.

Speoiiicaton` o Letters Patent.

atented Apr. 11, .1911.

Application tiled AugustZ, 1909, Serial No. 514,249. Renewed January 19, 1911, Seria-11H0', 303,592.l

To all whom it may concern: Be it-knownrthat We, CHARME FAWoE'rT and VILUAM A. MAYFi'nLn, citizens of the United States, residing at Bolivar, in the county of Hardeman, State of Tennessee, have invented certain new and useful improvements 1n Nut-Locks; and We do hereby declare the following to be a ful-l, clear, and

exact description of the invention, such as.

will enable others skilled in the art to which it appertains to make and use the same.

The vinvention relates to n'ut locks and morerparticularly to the class of nut locks employing reversely threaded bolt nuts and a locking collar.

The primary object of the invention is the,

provision of a nut lockvwhich will effectually lock the nuts carried by the bolt and thereby prevent the same from becomingv looseor lostfr'om the bolt.

Another object ofthe invention is the rovision of a nut lock in which .the nuts o the bolt maybe securely lockedagainst displacement thereon and that'will enable ,the said nuts to be' removedv should the same become rusty so as to bind upon said bolt thus mak ing it'di'liicult to remove the same. v

A. further object of the invention is' the provision of a'nut lock which is simple i-n construction, strong, durable, effectual in` operation and comparatively inexpensive in the manufacture.. V

Vith these and other objects in view, the

` invention consists in the construction, corndisclose the of the invention to enable those skilled in the bination and arrangement of parts as hereinafter more fully described, in detail, illustrated in the' accompanying drawings, which referred form of embodiment art to practice the same and as pointed out in the claims hereunto appended.

In the drawings z-Figure 1 is a side elevation of the invention. Fig. 2 is a verticalv the Washers.

Similar-.reference characters indicate. corresponding parts throughout the several views in the drawin In the drawings, ise numeral 5 designates a bolt provided with a right hand' screw threaded portion 6, and also areduced extremity 7, with a left hand screw thread 8, for a distance of the same. An inner bolt nut 9, is provided on its inner surface with a right hand thread corresponding to and adapted to engage the threaded portion 6 of the bolt.

Engaging the reduced extremit 7 of the bolt is an outenbolt nut 10, the atter provided on its inner surface with a ieft hand screw thread corresponding to andadapted to engage the left hand screw tlurwd` 9, of

the bolt.

Carried by the inner and outer nuts 9 and 10, is a locking collar or nut 11, the latter provided on its inner surface with screw threads adapted to engage with the external-screw threaded surfaces 12 and\13 of the nut-s 9 and 10, when in proper position on the bolt.

thread thereof is formed anI annular groove 15, lthe* `samebeing loosely engaged on the Each of the nuts 9 and 10, is provided with nvvrench en aging surfaces 14, and'between this and-t e external" as follows: The inner nut '9, is first screwed vto place on the bolt 5, the interior right `hand thread of the nut engaging with the right hand thread 6 of the bolt. `itt being understood of course that the Washer 17, has

`been previously detached from the inner nut.

The locking collar or nut 11, is screwed onto theinner nutl 9, contiguous to the wrench engaging surfaces 14. thereof. The' outer nut 10, is then screwed onto the reduced extremity 7, of the bolt, its interior left hand screw engagingttheleft hand screw 8, of said extremity until said outer nut abuts against the inner nut. The locking collar or nut 11, is thenvscrevved outwardly sutiiciently to engage the eXternaYserew thread 13, of the outer nut, until it engages the vvashervl, carried by the outer nut. Finally the Washer 17, is driven onto the inner nut 9, Ito engage -and be seated in the annular groove thereon. When thus' assembled, the

arts are securely held without'liability of.

accidentally becoming loose or displaced as it will be impossible for the outer nut to turn or be turned .from the .bolt While it is engaged by the locking collar or nut. This -loelging vcollar nut isalso held against displacement by the split washer 17, when enga edwith the inner nut.

at s claimed is Y A 1. The combination with a bolthaving reversey threaded portions,- nuts detachably engage with said threaded portions respectively, both of said nuts being provided with abutment shoulders, a collar surrounding said nuts and in threaded engagement therewith, a permanent means surrounding one of 'said nuts loetween one end of the said collar and the adjacent shoulder of the said nut, and a detachable means surrounding the other nut between the other end of the said collar and the adjacent shoulder ofthe said nut. Y

2. The combination lwith a bolt haring reversely threaded portions, nuts detaehably nut.

In testimony whereof. we afx our signaengaged' with said threaded portions respectively,both of said nuts being provided with 'abutment shoulders, a collar surrounding tures, in presence of two Witnesses.

CHARLIE M. FAVCETT, WILLIAM A. MAYFIELD.

lVitnesses A WV. E. MAYFIELD, E. A. MAYFIELD. 

